We make every effort to ensure the data presented here is accurate based on the best available information currently on file with DEC. It is therefore subject to change as new information becomes available. We recommend contacting the assigned project staff prior to making decisions based on this information.

Problems/Comments

The site consists of a half an acre pad approximately 5-7 feet thick adjacent to the railroad tracks. It is reportedly the former location of a section house and associated facilities. At the time of the assessment in 1993 the land was vacant with the exception of two storage sheds and the UST's. There were two 1,000 gallon diesel tanks located side by side. The fuel was used for the generator that was previously located at the site. The USTs were excavated on September 9, 1993. Soil was removed to a depth of approximately 7 feet below ground surface. Water was encountered at 7 feet bgs, but it is unknown if the water represents shallow groundwater or surface water impoundment beneath the pad. Groundwater has not been sampled. Soil samples collected from the base of the excavation at the water/soil interface show the presence of DRO contamination up to 18,000 mg/kg. Approximately 25-35 cubic yards of soil was excavated and stockpiled onsite. Composite samples collected from the excavation show DRO up to 11,000 mg/kg. A site chacterization peformed in 2007 indicates DRO contamination up to 4,860 mg/kg remains on site. Groundwater was not encountered.

Action Information

Action Date

Action

Description

DEC Staff

9/9/1993

Site Added to Database

* Not Assigned

9/9/1993

Leaking Underground Storage Tank Release Confirmed - Petroleum

LUST Site created in CSP for source area ID 77753 ADD;

* Not Assigned

10/7/1993

Update or Other Action

UST Closure Site Assessment, Broad Pass, Alaska submitted by Shannon & Wilson on this date. Two 1,000 gal diesel USTs were removed. The surface soil surrounding the USTs had a petroleum stain and odor. 25 to 35 cubic yards of contaminated soil was removed during tank excavations. Groundwater with an oily film/emulsion was encountered at 7 ft. bgs, but it was not know whether the water represented groundwater or surface water impoundment beneath the pad. Two soil confirmation samples collected at the depths of the excavation at 7 feet bgs indicated DRO contamination up to 18,000 mg/kg. Prior to backfilling excavation with clean fill, a ventilation gallery was installed.

Grant Lidren

10/9/1993

Leaking Underground Storage Tank Cleanup Initiated - Petroleum

LCAU; LUST corrective action underway.

* Not Assigned

5/16/1994

Underground Storage Tank Site Characterization or Assessment

SA1R; Documented high levels of contamination at the soil/groundwater interface.

* Not Assigned

1/28/2004

Update or Other Action

Transferred DEC staff lead from John Carnahan

Cynthia Pring-Ham

8/4/2005

Update or Other Action

File number issued 150.26.036.

Aggie Blandford

8/11/2005

Update or Other Action

Problem statement added following site file review. No documentaion is present in the site file which would indicate cleanup has begun or has been completed.

Sarah Cunningham

8/11/2005

Update or Other Action

Emailed ARRC contact requesting any more current information about the site.

Sarah Cunningham

8/19/2005

Update or Other Action

ARRC returned email from 8/11/2005 indicating that no more work has been done at the site since 1993.

Sarah Cunningham

8/29/2005

Update or Other Action

Emailed ARRC contact regarding the fate of the stockpiles generated from the removal of the two tanks-the stockpile had been lined, covered, and secured in 1993, but no records indicate that it was removed.

Sarah Cunningham

8/17/2006

Underground Storage Tank Site Characterization or Assessment

Approved Work Plan to Excavate three test pits and collect up to six samples in the area of the 1993 excavation to confirm complete removal of impacted soil. The existing stockpile will also be screened using a PID and up to two samples will be collected.

Bill O'Connell

1/23/2007

Underground Storage Tank Site Characterization or Assessment

Received Sub-surface Investigation Former Broad Pass Section House. ARRC excavated 4 test pits near the former USTs. Only one test pit contained contamination above cleanup levels. DRO was detected in TP 2 at 4,860 mg/kg. Stockpile was also sampled with results below cleanup levels so stockpile will be spread on site. No GW encountered in test pits.

Bill O'Connell

3/16/2007

Exposure Tracking Model Ranking

Intial Ranking Completed

Bill O'Connell

6/2/2008

Update or Other Action

Longitude and Latitude updated with Google Earth

Grant Lidren

5/8/2009

Site Characterization Workplan Approved

ADEC received a Work Plan for Drainage Ditch Water Sampling Broad Pass, dated May 7, 2009, and submitted by Clarus.

Grant Lidren

12/3/2009

Report or Workplan Review - Other

On this date, ADEC received Drainage-Ditch Water Sampling Broad Pass, dated November 24, 2009, submitted by Clarus. The drainage-ditch water sample collected at the south end of the culvert, analyzed for RRO, DRO, GRO, & BTEX, was non- detect.

Grant Lidren

2/24/2010

Cleanup Complete Determination Issued

The Alaska Department of Environmental Conservation (ADEC), Contaminated Sites Program has completed a review of the environmental records associated with the ARRC - Broad Pass Railroad Station. Based on the information provided to date, the ADEC has determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment, and no further remedial action will be required as long as the site is in compliance with established institutional controls. This decision is based on the administrative record for ARRC - Broad Pass Railroad Station site, which is located in the offices of the ADEC in Anchorage, Alaska.

Grant Lidren

2/24/2010

Institutional Control Record Established

Institutional Controls established and entered into the database.

Grant Lidren

11/17/2010

Report or Workplan Review - Other

On this date ADEC received UST Removal Report Broad Pass Section House submitted by Clarus and dated October 29, 2010. During the drainage ditch sampling effort of 2009, A previously unknown 500 gallon heating oil UST was discovered. The UST was found to be partially open and submerged with water. In 2010, the UST was purged of water and removed from the site. Three soil samples collected 6 inches below the former UST, at 3.75 ft. bgs, contained benzene up to 0.387 mg/kg. The excavation was then backfilled with stockpiled soils and clean fill to bring to grade.

Grant Lidren

6/13/2012

Update or Other Action

Staff changed from Grant Lidren to IC Unit.

Kristin Thompson

6/13/2012

Institutional Control Compliance Review

IC review conducted and reminder system set-up for 2015 follow-up with responsible party.

Kristin Thompson

4/2/2015

Institutional Control Update

An IC reminder letter was issued to the responsible party on this date.

Kristin Thompson

4/14/2015

Institutional Control Update

ADEC was contacted by the responsible party in response to the IC reminder letter. There has been no change in land use or ownership at this site since the 2010 establishment of institutional controls.

Kristin Thompson

Contaminant Information

Name

Level Description

Media

Comments

DRO

Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation

Missing Location Data

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